I use it as a timpani tuner in my school band. The volume switch is very nice so that you don't have this insanely loud note over the entire ensemble when retuning drums. The only thing I would change is that I would have both the sharp and flat values written. It's not a huge deal but would require no thought at all if the flats were already on it. Otherwise, this thing works wonders.

I've used this unit for a short while and it works very well. I like the fact that when you press the note, it will sound long enough to get you in tune and all you do is press the note again to get it to stop. The only inconvenience would be the battery. It's a round/flat type, so you need to buy a spare. You probably won't have one of these just lying around. But the unit works as advertised and I would recommend it.